Process for manufacturing siamese-type cylinder block

Metal founding – Process – Shaping liquid metal against a forming surface

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164108, B22D 1700, B22D 1900, B22D 2500

Patent

active

051217864

ABSTRACT:
A process for manufacturing a siamese-type clyinder block which is disclosed herein comprises a blank making step of providing a cylinder block blank in which a sleeve made of a cast iron is cast in each cylinder barrel of a siamese-type barrel made of an aluminum alloy and consisting of a plurality of cylinder barrels connected in series, and a mechanically working or machining step of forming the inner peripheral surface of each sleeve of the cylinder block blank into a true circle. The process is characterized in that the blank making step includes placing highly rigid sleeves each having a thickness set as large as 10% or more of the inner diameter thereof into a siamese-type cylinder barrel molding cavity in a mold and then pouring a molten metal of aluminum alloy under a pressure into the cavity to effect a casting. The sleeve is cast-in as it is at an ambient temperature or in a heated state. A cylinder block blank resulting from the casting-in of sleeves at an ambient temperature is subjected to a thermal treatment for reducing the casting strain in each cylinder barrel.

REFERENCES:
patent: 3130461 (1964-04-01), Curtis
patent: 3807012 (1974-04-01), Logvist
patent: 3977459 (1976-08-01), Bonitz
patent: 4003422 (1977-01-01), Schramm et al.
patent: 4336076 (1982-06-01), Edamura et al.
patent: 4411709 (1983-10-01), Nakanishi
patent: 4420345 (1983-12-01), Ito et al.

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